Description from Flora of China
Herbs perennial, glabrous, erect, to 40 cm tall. Stems usually numerous, terete or weakly angular, shortly branched, copiously minutely glandular at apex. Leaves spirally arranged; petiole 2--3 mm; leaf blade linear, 30--85 X 2.5--6 mm, papery, tapering to both ends, margin narrowly revolute, apex often falcate; midvein raised abaxially, slightly impressed adaxially; veinlets obscure. Pedicel filiform, 1--2 cm, elongating to 3 cm in fruit. Flowers solitary, axillary. Calyx lobes ovate, ca. 1.5 mm, glandular on margin and inside, apex acuminate. Corolla yellow, 5--6 mm, deeply parted; lobes nearly linear, 4--5 X ca. 1.5 mm, apex obtuse. Filaments connate basally into a ca. 0.4 mm high ring, fused with corolla, free parts ca. 0.5 mm; anthers ca. 3.2 mm, basifixed, opening by apical pores. Style ca. 4 mm. Capsule globose, ca. 3 mm in diam. Fl. May.
* Shaded areas on mountain slopes. NW Guangxi (Tianlin Xian).